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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman , Shuah Khan , Petr Machata , netdev@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] selftests: net: forwarding: cleanup veth peers created via NUM_NETIFS Message-ID: References: <20260120230905.328528-1-aleksey.oladko@virtuozzo.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260120230905.328528-1-aleksey.oladko@virtuozzo.com> On Tue, Jan 20, 2026 at 11:09:05PM +0000, Aleksei Oladko wrote: > Some net/forwarding kselftests set NUM_NETIFS, causing lib.sh to create > the requested number of veth peer interfaces. > > These interfaces are not removed when the tests finish, leaving stale > veth devices in the system. This can cause subsequent tests to fail, > for example min_max_mtu.sh. > > Ensure that veth peers created via NUM_NETIFS are properly removed at > the end of the tests to avoid interference between test runs. > > Signed-off-by: Aleksei Oladko > --- > tools/testing/selftests/net/forwarding/lib.sh | 4 ++++ > 1 file changed, 4 insertions(+) > > diff --git a/tools/testing/selftests/net/forwarding/lib.sh b/tools/testing/selftests/net/forwarding/lib.sh > index a9034f0bb58b..ae7699c0c7e5 100644 > --- a/tools/testing/selftests/net/forwarding/lib.sh > +++ b/tools/testing/selftests/net/forwarding/lib.sh > @@ -597,6 +597,10 @@ vrf_cleanup() > ip -6 rule del pref 32765 > ip -4 rule add pref 0 table local > ip -4 rule del pref 32765 > + > + for ((i = 1; i <= NUM_NETIFS; i=$i+2)); do I'd suggest 'i = i + 2' here instead of "i=$i+2", as it seems closer to the rest of lib.sh style. > + ip link delete dev ${NETIFS[p$i]} 2>/dev/null || true > + done > } > > adf_vrf_prepare() > -- > 2.43.0 > I see that some tests that set NUM_NETIFS do not seem to call vrf_cleanup() (e.g. bridge_activity_notify.sh), so I think those tests will still leak? Maybe lib.sh needs a remove_netif() to go along with create_netif(), and then tests can call it from their 'cleanup()' EXIT handlers? This avoids the mismatch between vrf_prepare() not creating devices but vrf_cleanup() removing them. Thanks, Bobby